﻿#include<hgl/ut/Hash.h>
#include<hgl/type/DataType.h>

namespace hgl
{
	namespace util
	{
		/* Constants for MD4Transform routine. */
		#define S11 3
		#define S12 7
		#define S13 11
		#define S14 19
		#define S21 3
		#define S22 5
		#define S23 9
		#define S24 13
		#define S31 3
		#define S32 9
		#define S33 11
		#define S34 15

		/* F, G and H are basic MD4 functions. */
		#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
		#define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
		#define H(x, y, z) ((x) ^ (y) ^ (z))


		/* ROTATE_LEFT rotates x left n bits. */
		#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))


		/* FF, GG and HH are transformations for rounds 1, 2 and 3 */
		/* Rotation is separate from addition to prevent recomputation */
		#define FF(a, b, c, d, x, s) { \
			(a) += F ((b), (c), (d)) + (x); \
			(a) = ROTATE_LEFT ((a), (s)); \
		}
		#define GG(a, b, c, d, x, s) { \
			(a) += G ((b), (c), (d)) + (x) + (uint32)0x5a827999; \
			(a) = ROTATE_LEFT ((a), (s)); \
		}
		#define HH(a, b, c, d, x, s) { \
			(a) += H ((b), (c), (d)) + (x) + (uint32)0x6ed9eba1; \
			(a) = ROTATE_LEFT ((a), (s)); \
		}


		void md4_encode(unsigned char* output, const uint32* input, unsigned int len)
		{
			unsigned int i, j;

			for (i = 0, j = 0; j < len; i++, j += 4)
			{
				output[j]   = (unsigned char)(input[i] & 0xff);
				output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
				output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
				output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
			}
		}


		void md4_decode(uint32* output, const unsigned char* input, unsigned int len)
		{
			unsigned int i, j;

			for (i = 0, j = 0; j < len; i++, j += 4)
				output[i] = ((uint32)input[j]) | (((uint32)input[j+1]) << 8) |
							(((uint32)input[j+2]) << 16) | (((uint32)input[j+3]) << 24);
		}

		void md4_transform (uint32 state[4], const unsigned char block[64])
		{
			uint32 a = state[0], b = state[1], c = state[2], d = state[3], x[16];

			md4_decode(x, block, 64);

			/* Round 1 */
			FF (a, b, c, d, x[ 0], S11); /* 1 */
			FF (d, a, b, c, x[ 1], S12); /* 2 */
			FF (c, d, a, b, x[ 2], S13); /* 3 */
			FF (b, c, d, a, x[ 3], S14); /* 4 */
			FF (a, b, c, d, x[ 4], S11); /* 5 */
			FF (d, a, b, c, x[ 5], S12); /* 6 */
			FF (c, d, a, b, x[ 6], S13); /* 7 */
			FF (b, c, d, a, x[ 7], S14); /* 8 */
			FF (a, b, c, d, x[ 8], S11); /* 9 */
			FF (d, a, b, c, x[ 9], S12); /* 10 */
			FF (c, d, a, b, x[10], S13); /* 11 */
			FF (b, c, d, a, x[11], S14); /* 12 */
			FF (a, b, c, d, x[12], S11); /* 13 */
			FF (d, a, b, c, x[13], S12); /* 14 */
			FF (c, d, a, b, x[14], S13); /* 15 */
			FF (b, c, d, a, x[15], S14); /* 16 */

			/* Round 2 */
			GG (a, b, c, d, x[ 0], S21); /* 17 */
			GG (d, a, b, c, x[ 4], S22); /* 18 */
			GG (c, d, a, b, x[ 8], S23); /* 19 */
			GG (b, c, d, a, x[12], S24); /* 20 */
			GG (a, b, c, d, x[ 1], S21); /* 21 */
			GG (d, a, b, c, x[ 5], S22); /* 22 */
			GG (c, d, a, b, x[ 9], S23); /* 23 */
			GG (b, c, d, a, x[13], S24); /* 24 */
			GG (a, b, c, d, x[ 2], S21); /* 25 */
			GG (d, a, b, c, x[ 6], S22); /* 26 */
			GG (c, d, a, b, x[10], S23); /* 27 */
			GG (b, c, d, a, x[14], S24); /* 28 */
			GG (a, b, c, d, x[ 3], S21); /* 29 */
			GG (d, a, b, c, x[ 7], S22); /* 30 */
			GG (c, d, a, b, x[11], S23); /* 31 */
			GG (b, c, d, a, x[15], S24); /* 32 */

			/* Round 3 */
			HH (a, b, c, d, x[ 0], S31); /* 33 */
			HH (d, a, b, c, x[ 8], S32); /* 34 */
			HH (c, d, a, b, x[ 4], S33); /* 35 */
			HH (b, c, d, a, x[12], S34); /* 36 */
			HH (a, b, c, d, x[ 2], S31); /* 37 */
			HH (d, a, b, c, x[10], S32); /* 38 */
			HH (c, d, a, b, x[ 6], S33); /* 39 */
			HH (b, c, d, a, x[14], S34); /* 40 */
			HH (a, b, c, d, x[ 1], S31); /* 41 */
			HH (d, a, b, c, x[ 9], S32); /* 42 */
			HH (c, d, a, b, x[ 5], S33); /* 43 */
			HH (b, c, d, a, x[13], S34); /* 44 */
			HH (a, b, c, d, x[ 3], S31); /* 45 */
			HH (d, a, b, c, x[11], S32); /* 46 */
			HH (c, d, a, b, x[ 7], S33); /* 47 */
			HH (b, c, d, a, x[15], S34); /* 48 */

			state[0] += a;
			state[1] += b;
			state[2] += c;
			state[3] += d;

			/* Zeroize sensitive information. */
			memset(x, 0, sizeof(x));
		}

		class MD4:public Hash
		{
			enum
			{
				BLOCK_SIZE  = 64,
				DIGEST_SIZE = 16
			};

			uint32 state[4];          // state (ABCD)
			uint32 count[2];          // number of bits, modulo 2^64 (lsb first)
			uchar buffer[64]; // input buffer

		public:

			void GetName(UTF8String &str)const HGL_OVERRIDE{str="MD4";}
			void GetName(UTF16String &str)const HGL_OVERRIDE{str=U16_TEXT("MD4");}

			const int GetHashBytes()const HGL_OVERRIDE{return DIGEST_SIZE;}

			void Init()HGL_OVERRIDE
			{
				count[0] = count[1] = 0;
				state[0] = 0x67452301;
				state[1] = 0xefcdab89;
				state[2] = 0x98badcfe;
				state[3] = 0x10325476;
			}

			void Update(const void *input,uint inputLen)HGL_OVERRIDE
			{
				unsigned int i, index, partLen;

				/* Compute number of bytes mod 64 */
				index = (unsigned int)((count[0] >> 3) & 0x3F);

				/* Update number of bits */
				if ((count[0] += ((uint32) inputLen << 3)) < ((uint32) inputLen << 3))
					count[1]++;
				count[1] += ((uint32) inputLen >> 29);

				partLen = 64 - index;

				/* Transform as many times as possible. */
				if (inputLen >= partLen)
				{
					memcpy(&buffer[index], input, partLen);
					md4_transform(state, buffer);

					for (i = partLen; i + 63 < inputLen; i += 64)
						md4_transform(state, ((uchar *)input)+i);

					index = 0;
				}
				else i = 0;

				/* Buffer remaining input */
				memcpy(&buffer[index], ((uchar *)input)+i, inputLen-i);
			}

			void Final(void *digest)HGL_OVERRIDE
			{
				static const unsigned char PADDING[64] =
				{
					0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
					0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
					0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
				};
				unsigned char bits[8];
				unsigned int index, padLen;

				/* Save number of bits */
				md4_encode(bits, count, 8);

				/* Pad out to 56 mod 64. */
				index = (unsigned int)((count[0] >> 3) & 0x3f);
				padLen = (index < 56) ? (56 - index) : (120 - index);
				Update(PADDING, padLen);

				/* Append length (before padding) */
				Update(bits, 8);

				/* Store state in digest */
				md4_encode((uchar *)digest, state, 16);
			}
		};//class MD4

		Hash *CreateMD4Hash(){return(new MD4);}
	}//namespace util
}//namespace hgl
